20.500.12556/RUL-171341 Vpliv termične stratifikacije vode na mehanski odziv cevi Influence of water thermal stratification on the mechanical response of pipes Cevovodi v nuklearnih elektrarnah so lahko podvrženi pojavu termične stratifikacije vode, ki povzroči visok temperaturni gradient po višini cevi. S tem nastanejo termične obremenitve, ki v zasnovi mnogih elektrarn niso bile upoštevane. V magistrskem delu je najprej rekonstruiran primer obravnavanega cevovoda s podrobno prikazanimi posameznimi tokovnimi in termo-mehanskimi analizami. Nato je obravnavan vpliv geometrijskih parametrov cevi na mehanski odziv zaradi termične stratifikacije pregrete vode. V programskem okolju Ansys Fluent so bile izvedene tokovne analize, nato pa z izvoženim temperaturnim poljem cevi še termo-mehanske analize v programskem okolju Abaqus. S primerjavo končnih rezultatov posameznih cevi je bilo ugotovljeno, da se zaradi termične stratifikacije najbolj plastično deformirajo cevi večje dolžine in premera ali manjše debeline. Pipelines in nuclear power plants can be subject to the phenomenon of thermal stratification of water, which causes a high temperature gradient along the height of the pipe. This creates thermal loads that were not taken into account in the design of many power plants. In the master's thesis, the example of the pipeline under consideration is first reconstructed with detailed individual flow and thermo-mechanical analyses. Then, the influence of the geometric parameters of the pipe on the mechanical response due to thermal stratification of superheated water is discussed. Flow analyses were performed in the Ansys Fluent software environment, and then thermo-mechanical analyses were performed in the Abaqus software environment with the exported temperature field of the pipe. By comparing the final results of individual pipes, it was found that pipes of greater length and diameter or smaller thickness are most plastically deformed due to thermal stratification. termična stratifikacija termo-mehanska analiza tokovna analiza horizontalna cev geometrija cevi thermal stratification thermo-mechanical analysis flow analysis horizontal pipe pipe geometry true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-08-23 08:30:24 2025-08-23 08:30:32 2025-08-29 03:52:07 0000-00-00 00:00:00 2025 0 0 XXII, 76 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536:532.5:621.643(043.2) 274641 246653955 42942.pdf 42942.pdf 1 FBE13FF8A4C2A67E24354EC8FE424A52 e4aab6becec0f8fbef93f2e54ecd8bd1d720073be4d080331a24c090d5d6fe26 8ec99b8b-7fea-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214626 Fakulteta za strojništvo 0 0 0